253-PHDU-R6BX-C6-EE
FREQUENCY PROTECTOR COMBINED OVER AND UNDER FREQUENCY, SPEC. US STANDARD., INPUT. 277 VOLTS AC., RELAY OUTPUT WITH VOLT FREE CONTACTS, FREQUENCY. 60 HERTZ., RELAY Over De-Energize Under De-Energize
BYRAM27
FREQUENCY PROTECTOR COMBINED OVER AND UNDER FREQUENCY, SPEC. US STANDARD., INPUT. 277 VOLTS AC., RELAY OUTPUT WITH VOLT FREE CONTACTS, FREQUENCY. 60 HERTZ., RELAY Over De-Energize Under De-Energize